<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
        <!-- 开发环境版本，包含了有帮助的命令行警告 -->
        <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <!-- 模板内容 -->
    <div id="demo">
        <button @click="counter+=1">{{counter}}</button>
        <button v-on:click="cl">{{message}}</button>
        <button @click="say('h1')">这是一个按钮</button>
    </div>
    <!-- js -->
    <script>
        var demo = new Vue({
            el:"#demo",
            data:{
               message:'hello',
               counter:0,
               test:''
            },
            methods:{
                cl(){
                    this.message = this.message+'vue js!';
                },
                say(message) {
                    this.test = message;
                    alert(this.test);
                }
            }
        })
    </script>
</body>
</html>